Rolling element bearing fault diagnosis based on fault characteristic coefficienttemplate under time-varying rotating speed

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (7) : 123-129.

CHENG Weidong,ZHAO Dezun,LIU Dongdong

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Abstract

Compared to constant rotating speed condition,it is more difficult to diagnose bearing faults under time-varying rotating speed.On the other hand,the common method under time-varying rotating speed,i.e.,the order ratio analysis has some problems,such as,larger error and lower computing efficiency.In order to solve these problems,the method of rolling element bearing fault diagnosis based on fault characteristic coefficient template was proposed nere.It consisted of six main steps: ① a template was set up based on the fault characteristic coefficient computed according to geometric parameters of the target bearing; ② the bearing vibration signals were filtered via the fast spectral kurtosis filtering method; ③ the envelope time-frequency figures of the filtered signals were computed based on Hilbert transformation and short time Fourier transformation; ④ the instantaneous fault characteristic frequency trend curve was extracted from the envelope time-frequency figures with the spectral peak search algorithm; ⑤ the speed curve of the bearing was calculated with the rotating speed pulse signals; ⑥ the ratio of the instantaneous fault characteristic frequency to the instantaneous rotating frequency is the instantaneous fault characteristic coefficient for diagnosing the fault type of the bearing.The effectiveness of the proposed method was validated using both simulated and actual measured rolling element bearing faulty vibration signals.

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time-varying rotating speed / rolling element bearing / fault characteristic coefficient template

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CHENG Weidong,ZHAO Dezun,LIU Dongdong. Rolling element bearing fault diagnosis based on fault characteristic coefficienttemplate under time-varying rotating speed[J]. Journal of Vibration and Shock, 2017, 36(7): 123-129

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